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Employee Benefit Plans (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Jan. 03, 2015
Dec. 28, 2013
Defined Benefit Plan Disclosure [Line Items]    
Pending transactions not included in fair value measurements $ 41.5swy_DefinedBenefitPlanFairValueOfPlanAssetsPendingTransactionsNotIncludedInFairValueMeasurements $ 37.2swy_DefinedBenefitPlanFairValueOfPlanAssetsPendingTransactionsNotIncludedInFairValueMeasurements
Expected contributions to defined benefit plans in next fiscal year 268us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInNextFiscalYear  
Canada [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Contribution Plan, Cost Recognized $ 0.8us-gaap_DefinedContributionPlanCostRecognized
/ us-gaap_StatementGeographicalAxis
= country_CA
$ 0.1us-gaap_DefinedContributionPlanCostRecognized
/ us-gaap_StatementGeographicalAxis
= country_CA